CN201269235Y - Hydraulic energy-saving oil supply system of miniature hydraulic excavator - Google Patents
Hydraulic energy-saving oil supply system of miniature hydraulic excavator Download PDFInfo
- Publication number
- CN201269235Y CN201269235Y CNU2008201588913U CN200820158891U CN201269235Y CN 201269235 Y CN201269235 Y CN 201269235Y CN U2008201588913 U CNU2008201588913 U CN U2008201588913U CN 200820158891 U CN200820158891 U CN 200820158891U CN 201269235 Y CN201269235 Y CN 201269235Y
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- safety valve
- valve
- setting pressure
- main pump
- supply system
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- Fluid-Pressure Circuits (AREA)
Abstract
The utility model discloses a hydraulic energy-saving oil supply system of a small hydraulic excavator, comprising a first main pump (6), a first safety valve (7), a second main pump (5), a second safety valve (3), a reversing valve (2), a check valve (1) and an oil tank (4). The setting pressure of the first safety valve (7) is less than that of the second safety valve (3); unloading devices are distributed between the first main pump (6) and the inlet of the check valve (1); and the setting pressure of the unloading device is less than or equal to that of the first safety valve (7). The unloading device is a hydraulic control safety valve (8), a hydraulic control pipe (9) of which is connected between the inlets of the check valve (1) and the reversing valve (2); and the setting pressure of the hydraulic control safety valve (8) is less than or equal to that of the first safety valve (7). The utility model is a hydraulic energy-saving oil supply system of a small hydraulic excavator, which does not have energy loss when a plurality of pumps supply oil and has simple structure and reliable performance.
Description
Technical field
The utility model relates to a kind of hydraulic oil supply system, particularly relates to a kind of hydraulic energy-saving oil supply system of many oil pump feeds of small type hydraulic excavator.
Background technique
There is the method for arranging as Fig. 1 in the hydraulic oil supply system of many oil pump feeds of small type hydraulic excavator:
2 main pumps are given the selector valve fuel feeding simultaneously; 2 pumps, first safety valve, the second safety valve setting pressure difference separately, wherein the setting pressure of first safety valve is less than the setting pressure of second safety valve; On the lower pipeline of safety valve setting pressure, be furnished with one-way valve before two pump fluid interflow.
First safety valve setting pressure: the p1
Second safety valve setting pressure: the p2
Selector valve inlet pressure: p
When p1＜p＜p2, second pump is given the selector valve fuel feeding, and the oil liquid pressure of first pump reaches p1, through the first safety valve oil sump tank, therefore has the overflow energy loss of first pump.
The model utility content
There is not the hydraulic energy-saving oil supply system of the small type hydraulic excavator of overflow energy loss in technical problem to be solved in the utility model when providing a kind of many oil pump feeds.
In order to solve the problems of the technologies described above, the hydraulic energy-saving oil supply system of the small type hydraulic excavator that the utility model provides, comprise first main pump, first safety valve, second main pump, second safety valve, selector valve, one-way valve and fuel tank, the setting pressure of first safety valve is less than the setting pressure of second safety valve, be furnished with relief arrangement between described first main pump and described one-way valve inlet, the setting pressure of described relief arrangement is less than or equal to the setting pressure of first safety valve.
Described relief arrangement is a pilot safety valve, and the hydraulic control pipe of described pilot safety valve is connected between described one-way valve and the described selector valve inlet, and the setting pressure of described pilot safety valve is less than or equal to the setting pressure of first safety valve.
Adopt the hydraulic energy-saving oil supply system of the small type hydraulic excavator of technique scheme, with the pressure of the selector valve ingress behind the one-way valve start signal as pilot safety valve.The setting pressure of pilot safety valve is less than or equal to the setting pressure of first safety valve; Wherein the setting pressure of first safety valve is less than the setting pressure of second safety valve.First safety valve setting pressure: the P1, second safety valve setting pressure: the p2, pilot safety valve is set: p3, selector valve inlet pressure: p, wherein: p3＜p2, P1＜p2, when p3＜p＜p2, second main pump is given the selector valve fuel feeding, the fluid of first main pump has reduced the energy loss of first main pump this moment because pilot safety valve is in open mode at this moment, and fluid directly flows back to fuel tank.
The hydraulic energy-saving oil supply system that does not have the small type hydraulic excavator of overflow energy loss and simple in structure, reliable performance when in sum, the utility model is a kind of many oil pump feeds.
Description of drawings
Fig. 1 is the hydraulic oil supply system structural representation of original small type hydraulic excavator;
Fig. 2 is a structural representation of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 2, first main pump 6 is provided with first safety valve 7, second main pump 5 is provided with second safety valve 3, the setting pressure of first safety valve 7 is less than the setting pressure of second safety valve 3,6 outlets of first main pump are communicated with selector valve 2 inlets by one- way valve 1,5 outlets of second main pump directly are communicated with selector valve 2 inlets, first main pump 6 is connected with fuel tank 4 with second main pump, 5 inlets, 3 outlets are connected with fuel tank 4 first safety valve 7 with second safety valve, be furnished with a pilot safety valve 8 at first main pump 6 and 1 on one-way valve, the hydraulic control pipe 9 of pilot safety valve 8 is connected between one-way valve 1 and selector valve 2 inlets, and the setting pressure of pilot safety valve 8 is less than or equal to the setting pressure of first safety valve 7.
Referring to Fig. 2, arrange a pilot safety valve 8 at first main pump 6 to 1 on one-way valve, the pressure of selector valve 2 ingress behind the usefulness one-way valve 1 is as the start signal of pilot safety valve 8.The setting pressure of pilot safety valve 8 is less than or equal to the setting pressure of first safety valve 7; Wherein the setting pressure of first safety valve 7 is less than the setting pressure of second safety valve 3.
First safety valve, 7 setting pressures: P1
Second safety valve, 3 setting pressures: p2
Selector valve 2 inlet pressures: p
Wherein: p3＜p2, P1＜p2
When p3＜p＜p2, second main pump 5 is given selector valve 2 fuel feeding, and the fluid of first main pump 6 has reduced the energy loss of first main pump 6 this moment because pilot safety valve is in open mode 8 this moments, and fluid directly flows back to fuel tank 4.
Referring to Fig. 1 and Fig. 2, because the unlatching of pilot safety valve 8 is by the pressure of 2 ingress of the selector valve behind the one-way valve 1 start signal as pilot safety valve 8, do not need the pressure of first main pump 6 to open, reduced the energy loss of first main pump 6, reached purpose of energy saving.
Claims (2)
1, a kind of hydraulic energy-saving oil supply system of small type hydraulic excavator, comprise first main pump (6), first safety valve (7), second main pump (5), second safety valve (3), selector valve (2), one-way valve (1) and fuel tank (4), the setting pressure of first safety valve (7) is less than the setting pressure of second safety valve (3), it is characterized in that: be furnished with relief arrangement between described first main pump (6) and described one-way valve (1) inlet, the setting pressure of described relief arrangement is less than or equal to the setting pressure of first safety valve (7).
2, the hydraulic energy-saving oil supply system of small type hydraulic excavator according to claim 1, it is characterized in that: described relief arrangement is a pilot safety valve (8), the hydraulic control pipe (9) of described pilot safety valve (8) is connected between described one-way valve (1) and described selector valve (2) inlet, and the setting pressure of described pilot safety valve (8) is less than or equal to the setting pressure of first safety valve (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201588913U CN201269235Y (en) | 2008-10-24 | 2008-10-24 | Hydraulic energy-saving oil supply system of miniature hydraulic excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201588913U CN201269235Y (en) | 2008-10-24 | 2008-10-24 | Hydraulic energy-saving oil supply system of miniature hydraulic excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201269235Y true CN201269235Y (en) | 2009-07-08 |
Family
ID=40841833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201588913U Expired - Fee Related CN201269235Y (en) | 2008-10-24 | 2008-10-24 | Hydraulic energy-saving oil supply system of miniature hydraulic excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201269235Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677734A (en) * | 2012-05-25 | 2012-09-19 | 浙江苏强格液压股份有限公司 | Hydraulic system of excavating machine |
| CN113898620A (en) * | 2021-07-22 | 2022-01-07 | 浙江大学 | Flexible loading and unloading method for large-flow pump station |
-
2008
- 2008-10-24 CN CNU2008201588913U patent/CN201269235Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102677734A (en) * | 2012-05-25 | 2012-09-19 | 浙江苏强格液压股份有限公司 | Hydraulic system of excavating machine |
| CN102677734B (en) * | 2012-05-25 | 2015-07-15 | 浙江苏强格液压股份有限公司 | Hydraulic system of excavating machine |
| CN113898620A (en) * | 2021-07-22 | 2022-01-07 | 浙江大学 | Flexible loading and unloading method for large-flow pump station |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 Termination date: 20141024 |
|
| EXPY | Termination of patent right or utility model |